Moon is the natural satellite of the Earth and the other planets that orbits them. Different phases happen because only parts of the lit side are visible.
What are the phases of the moon?The moon is the natural satellite of the earth and orbits the planet because of which the various phases of the moon are observed from the planet. The sun is the source of the energy and light that gets absorbed and reflected by the moon and stars.
When the moon orbits the planet then only some of its portion is lit and reflected to the viewers. The phases like Crescent, Quarter, Full and new moon are seen.
Therefore, option B. parts of the lit side are only visible.
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A refrigeration lubricant with a high _____ point may have excessive wax separation, which can clog the system.
Answer:
ozone
Explanation:
A refrigeration lubricant with a high floc point may have excessive wax separation, which can clog the system.
What is floc point?The Floc point of the oil can be described as the temperature at which wax will start to precipitate from a mixture. When a mixture of 90% by volume of R-12 and 10% oil by Volume under the specified conditions.
Since the oil-soluble refrigerants lower the viscosity of the oil and affect both the pour point and cloud point. The floc point of the oil is a more important property where oil miscible refrigerants are used.
The results are used to compare the waxing tendency of the various different oils. It provides a method for determining the waxing tendency of the refrigeration lubricant. Floc point should not be confused with cloud point because cloud point is the temperature at which the wax is precipitated from the undiluted oil.
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A salt in which the anion is the conjugate _____ of a weak _____ will produce a basic solution. (Assume that the cation does not hydrolyze.)
Answer: conjugate base of a weak acid
Explanation: If the anion is a conjugate base of a weak acid, the solution would be basic. This is because weak acids do not produce enough hydrogen ions in the solution so does not really affect the acidity, so the conjugate base can react with water in the solution to produce a basic solution.
A scients produces zinc iodide (Zn).
This is the method used
1. Viegh 0.500g of iodine
2 Dissolve the iodine in ethanol
3. Add an excess of zinc
4 Sir the mature until there is no further change
5. Fiter of the excess zinc
5. Evaporate of the ethanol
a Calculate the minimum mass of zinc that needs to be added to 0.500 g of iodine so
that the iodine fully reacts
The equation for the reaction is
Zn + Zniz
Relative atomic masses (Me): Zn = 65
1 = 127
Answer im a little confused what exactly you need answered. please clarify
Explanation:
Answer:
Environment is the nature and surroundings in which all plants, animals, humans and other living beings live and operate. ... It includes sunlight, atmosphere, land, water, plants, animals, sea life, minerals, different species and everything that occurs naturally on earth.Explanation:
[tex] \: \: \: [/tex]
Can someone please help me on this?
Answer:
c
Explanation:
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A sample of nitrogen gas contains 9.46x10^23 atoms of nitrogen. How much nitrogen is expressed in grams? round your answer to the nearest whole number.
We know
[tex]\boxed{\star{\sf No\;of\:atoms=No\:of\: moles\times Avagadro's\: number}}[/tex]
[tex]\\ \rm\Rrightarrow No\:of\;moles=\dfrac{No\:of\:atoms}{Avagadro's\:no}[/tex]
[tex]\\ \rm\Rrightarrow No\:of\:moles =\dfrac{9.46\times 10^{23}}{6.022\times 10^{23}}[/tex]
[tex]\\ \rm\Rrightarrow No\:of\:moles=1.6mol[/tex]
Again
[tex]\boxed{\star{\sf Mass=Molar\:mass\times No\:of\:moles}}[/tex]
[tex]\\ \rm\Rrightarrow Mass=1.6(14)[/tex]
[tex]\\ \rm\Rrightarrow Mass=22.4g[/tex]
Select the correct answer.
A certain reaction has this form: aA bB.
At a particular temperature and [A]0 = 2.00 x 10-2 Molar, concentration versus time data were collected for this reaction and a plot of ln[A]t versus time resulted in a straight line with a slope value of -2.97 x 10-2 min-1.
How much time is required for the concentration of A to decrease to 2.50 x 10-3 Molar?
A.
70.03 minutes
B.
0.0096 minutes
C.
0.589 minutes
D.
29.70 minutes
E.
100 minutes
Answer:
uhm I think it would be letter C. 0.589
Fill in the blank :
______ ________ are the electrons of an atom that participate in chemical reactions. These electrons determine the basis for the periodic properties of an element.
Answer:
The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons
Explanation:
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how many moles of methane (ch4) are in 7.31x10^25 molecules help please
Answer:
1.168 x 10^28
Explanation:
CH4= carbon + hydrogen: 12+(4 x1)= 16g
16 7.3 x 10^25
----- x ------------------- = 1.168 x 10^28
1 1
What do chemical equilibrium constants tell us about the reaction?.
Answer:
Equilibrium Constant Definition An equilibrium constant, Keq, is a variable that describes a chemical reaction’s tendency to proceed to completion, meaning all the reactants are converted to products. The equilibrium of a reaction is the point at which the conversion of reactants into products equals the conversion of products back into reactants.
Citation:
Biologydictionary.net Editors. "Equilibrium Constant." Biology Dictionary, Biologydictionary.net, 21 Feb. 2017, https://biologydictionary.net/equilibrium-constant/.
what is the most common element found in the universe?
Answer:
Carbon, my good sir hope it helps!
Explanation:
Nearly all weather occurs in the layer of the atmosphere called the ____
Answer:
Troposphere where the humans live and the lowest level of layer of atmosphere
Suppose a particular star is projected from a firework at a starting height of 520 feet with an initial upward velocity of 72ft/sec. The equation h= -16t^2+72t+520 gives the star's height in feet at time t in seconds
By finding the vertex of the parabola, we will see that the firework reaches the maximum height in 2.25 seconds.
How long will take to reach the maximum height of the path?
The height of the firework is given by:
h = -16*t^2 + 72*t + 520
This is a quadratic equation, the maximum will be at the vertex.
Remember that for a quadratic equation:
y = a*x^2 + b*x + c
The x-value of the vertex is:
x = -b/2a.
Then for our equation:
h = -16*t^2 + 72*t + 520
The vertex will be at:
t = -72/(2*-16) = 2.25s
This means that the firework will reach the maximum height in 2.25 seconds.
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Can someone help me??? Please
When water is electrolyzed, it splits into hydrogen and oxygen.
What can be said about the masses of the reactants and products?
(1 point)
The mass of water is equal to the mass of oxygen.
The mass of water is equal to the mass of oxygen.
The mass of water is equal to the mass of hydrogen.
The mass of water is equal to the mass of hydrogen.
The mass of hydrogen produced is equal to the mass of oxygen produced.
The mass of hydrogen produced is equal to the mass of oxygen produced.
The mass of water is equal to the combined mass of hydrogen and oxygen.
The mass of water is equal to the combined mass of hydrogen and oxygen.
The mass of water is equal to the combined mass of hydrogen and oxygen.
What is Mass?This is defined as the quantity of matter in a physical body. The electrolysis reaction of water can be seen below:
2 H₂O ---> 2 H₂ + O₂
We can deduce that 36 grams of H₂O dissociated to give 4 grams of H₂ and 32 grams of O₂ which option D was chosen as the appropriate choice.
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4Li + O₂ ⇒ 2Li₂O
Li₂O = 2/4 x 3.33 = 1.665
what is the frequency if the speed is 15 m/s and the wavelength is 3m ?
Answer:
5
Explanation:
15/3=5
as frequency = speed/ wavelength
Answer:
5Hz
Explanation:
Speed = Wavelength × Frequency
15. = 3. × ?
15 ÷ 3 = 5
Unit = Hz which means Hertz
Hope this helps
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When 84. 8 g of iron (III) oxide reacts with an excess of carbon
monoxide, iron is produced.
Fe2O3(s) + 3C0 (9) > 2 Fe(s) + 3 CO2 (g)
What is the theoretical yield of iron?
Answer:
Use the balanced equation to determine the theoretical yield. Focus on the chemicals whose quantities you are given or are asked to find. CO is not important as it is excess and will make sure that all of the Fe2O3 will be changed to iron. Remember the quotients (numbers in front of formula) are the number of moles. You are given the mass of Fe2O3 in grams so you will need to convert 1 mole of Fe2O3 into grams (molar mass which, using simple atomic masses = 56x2 + 16x3 = 160g/mol but you use atomic masses that your course requires
Fe2O3(s) + 3CO(g)--> 2Fe(s) + 3CO2(g)
1 mol 2 mol
160g 112g
84.8g (112/160) x 84.8
So now you have the theoretical yield of Fe2O3 and the experimental (actual) yield = 54.3g)
Percentage Yield = (actual yield/theoretical yield) x 100
(◠‿◕)
Which use of pomace has become more available through new technologies?
- food flavorings
- animal feed
- landscaping mulch
- soil additives
Answer:
1. From which source is pomace derived? unused waste from food processing
2. Which use of pomace has become more available through new technologies? food flavorings
3. Criteria and constraints help guide decision-making as people work to extract useful materials from pomace. Which option is an example of how a criterion for success is applied in this situation? The criterion of minimizing chemical waste favors the use of high-temperature, high-pressure water.
4. Criteria and constraints help in deciding which methods to use when extracting useful chemicals from pomace. Which option is an example of an important constraint on a process? Organic solvents are expensive, which limits their use for extracting chemicals.
5. Which constraint is driving the interest in extracting useful chemicals from pomace? Pomace is available in greater quantities than needed for traditional uses and would be wasted.
Explanation: Just took the quick check 5/5 correct
New technologies have increased the availability of food flavorings as a use of pomace.
What is Pomace?Olive pomace oil is vir-gin olive oil made from the pulp of olives after they have been pressed for the first time. Following mechanical oil extraction, approximately Most other edible oils, such as canola, peanut, and sunflower oil, must be extracted using solvents, which is an industrial method used in the manufacturing of most other edible oils.
New technologies have increased the availability of food flavorings as a use of pomace.
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true or false. the arrow labeled C represents a transfer of chemical energy to mechanical energy. explain why this is true or false.
true or false. the arrow labeled A represents a transfer of solar energy to chemical energy. explain why this is true or false.
Answer:
6. True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false.
a. This is __False_____ because: Factory uses Mechanical energy with is converted to chemical energy.
7. True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false.
a. This is __True_____ because: Solar energy from the sun is first, then a chemical reaction makes food for the plant.
Explanation:
Change up the spelling, put it in your own words, I didn't use advanced grammar, don't copy and paste, don't get a 0.
Would you have more kinetic energy if you are traveling fast or slow?
fast
slow
Answer:
fast
Explanation:
Because kinetic energy is equal to half the product of mass and square of velocity, increase in velocity would increase the kinetic energy as well.
Which subatomic particle is correctly paired with its properties?
A) Proton: positively charged, mass about equal to that of an electron
B) Neutron: no electric charge, mass about equal to that of a proton
C) Electron: negatively charged, mass about equal to a neutron
D) Positron: negatively charged, mass about equal to that of a proton.
Answer:
A. proton is positive charged ans and is equal to electrons
Proton positively charged, mass about equal to that of an electron subatomic particle is correctly paired with its properties.
The correct option is A.
What are subatomic particle made of?They include the heavier constituents of the small but extremely dense atom's nucleus, the positively charged protons and the electrically neutral neutrons, as well as the electrons, the negatively charged, nearly massless particles that still make up the majority of the atom's size.
Where is subatomic particle ?Two subatomic particles are bound together by the strong nuclear force to form the atomic nucleus. The proton is one of these subatomic elements. The neutron is the other. Similar in size and mass to protons, neutrons are electrically neutral or devoid of any net electrical charge.
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in an atom the number of protons must be equal of
Answer:
electrons
Explanation:
Answer:
Electrons
Explanation:
^^
Which best represents a homogeneous mixture of an element and a compound.
Answer:
The composition of air this is because it vmade up of oxygen, nitrogen, Nobel gages and Carbon dioxide
A transverse wave that has electrical and
magnetic properties is known as
A. magnetism
B. loudness
C. electricity
D. electromagnetic energy
What ions are formed when naoh is dissolved in water?.
Answer:
When sodium hydroxide (NaOH) dissolves in water, it separates into positively - charged sodium ions (cations) and negatively - charged hydroxide ions (anions).
Explanation:
what is a biom what dose it do and why is it a thing lol
Answer:
a major ecological community, extending over a large area and usually characterized by a dominant vegetation.
A block of ice is placed outside on a hot summer dayDescribe the changes in particle motion and the corresponding changes in energy as the ice melts and eventually becomes water vapor .
Answer:
When solid ice gains heat, it changes state from solid ice to liquid water in a process called melting. Ice cubes in a cold drink, for example, gradually melt. ... When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation.
Explanation:
When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, firstly melting and then evaporation takes place.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
Melting is the process by which solid ice transforms into liquid water when exposed to heat, while evaporation is the process by which it transforms into gas. During evaporation and melting, heat energy is taken from the surrounding.
Therefore, firstly melting and then evaporation takes place.
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At 45.2 L cylinder containing C2H2F4 at a pressure of 3.00 atm is connected by the valve to 4060 mL cylinder containing N2H4 at 1.50 atm pressure. Calculate the partial pressuure(atm) of N2H4 when the valve is opened.
The partial pressure of the N2H4 gas is 1.50 atm.
Dalton's law of partial pressureFrom the Dalton's law of partial pressure, the total pressure of a mixture of gases is the sum of the individual partial pressures of all the gases present in the mixture.
We have the following;
C2H2F4 = 3.00 atm
N2H4 = c
Total pressure = 3.00 atm + 1.50 atm = 4.50 atm
Hence, the partial pressure of the N2H4 is N2H4.
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An atom of oxygen has six electrons in its outermost ring and requires two more to become stable. What is the valence number of oxygen
Answer: Oxygen in its natural state has 6 valence electrons.
Explanation: The atomic number/ proton number of oxygen is 8, as seen on the periodic table. This is equal to the electron number.
This means there are 2 electrons in the core s shell (innermost), and 6 electrons in the p shell (outermost).
Valence electrons are the electrons found in the outermost shell, so Oxygen has 6 valence electrons.
I don't know if you've been taught electron configuration, but Oxygen's electron configuration is: [tex]1s^2 2s^2 2p^4[/tex] . The 2s and 2p are orbitals of the outermost ring in Oxygen, so adding 2+4 = 6 valence electrons.
In the measurement 0.342, which number is the estimated digit?
Answer:
"The last digit in any number is referred to as the estimated digit."
Explanation:
So it should be 2
